feat: Trends landing page with directorate overview chart (Task E.3)

dash_app/data/queries.py

@@ -30,6 +30,7 @@ from data_processing.pathway_queries import (
     get_drug_network as _get_drug_network,
     get_drug_timeline as _get_drug_timeline,
     get_dosing_distribution as _get_dosing_distribution,
+    get_trend_data as _get_trend_data,
 )
 
 DB_PATH = Path(__file__).resolve().parents[2] / "data" / "pathways.db"
@@ -251,3 +252,14 @@ def get_dosing_distribution(
     return _get_dosing_distribution(DB_PATH, date_filter_id, chart_type, directory, trust)
 
 
+# --- Trends query wrappers (Phase E) ---
+
+
+def get_trend_data(
+    metric: str = "patients",
+    directory: Optional[str] = None,
+    drug: Optional[str] = None,
+    group_by: str = "drug",
+) -> list[dict]:
+    """Time-series trend data from pathway_trends table."""
+    return _get_trend_data(DB_PATH, metric, directory, drug, group_by)